Man crush is a very strong feeling that one straight man has for another, bordering on the romantic but not the sexual. It's love allright but not the love that makes you want to get into his pants. It can be stronger than the love between a man and a woman.

Man crush is like the relationship between Vince Vaughn and Owen Wilson in Wedding Crashers.

the true test of determining a man crush is simple. If one has a man crush on someone else, that person would be willing to hold their crush all night long if asked. This holding is in no way sexual, simply emotional. And there is nothing wrong with sleeping in the same bed as another person towards whom you have no sexual attraction. man up.

Dan: i have a man crush Clive Owen. If he asked me to hold him all night long i would say yes

When a man/boy admires another man, can be a footballer, actor, athlete or singer.
It is by no means homosexual, and does not involve sexual feelings.
This 'man crush' can be based upon admiration and sometimes jealousy.
Men can often deny this man crush and slander their man-crush's image and achievements since they are jealous.
However, they feel very strongly about this crush, and it can often be based on the female attention this male receives.